static void Main(string[] args)
{
Handler sum = new SumHandler();
Handler sub = new SubHandler();
Handler div = new DivHandler();
Handler mult = new MultHandler();
sum.SetNext(sub);
sub.SetNext(div);
div.SetNext(mult);
Request r1 = new Request(2, 2, "+");
sum.HandleRequest(r1);
r1 = new Request(10, 5, "-");
sum.HandleRequest(r1);
r1 = new Request(5, 2, "/");
sum.HandleRequest(r1);
r1 = new Request(2, 2, "*");
sum.HandleRequest(r1);
Console.ReadKey();
}
